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QMetaType: Add qHash() overload

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This is needed for use in QHash and similar.
It's essentially the same as using the integer id, but typesafe

Change-Id: I9515b8e178c8f9828934cb0bb099cce5553ec393
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
This commit is contained in:
Mårten Nordheim 2022-04-04 19:40:52 +02:00
parent d2d202c648
commit d72f2ca9ea
2 changed files with 16 additions and 0 deletions
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8
src/corelib/kernel/qmetatype.cpp
View File

@ -3002,6 +3002,14 @@ static const QtPrivate::QMetaTypeInterface *interfaceForType(int typeId)
*/ */
QMetaType::QMetaType(int typeId) : QMetaType(interfaceForType(typeId)) {} QMetaType::QMetaType(int typeId) : QMetaType(interfaceForType(typeId)) {}
/*! \fn size_t qHash(QMetaType type, size_t seed = 0)
\relates QMetaType
\since 6.4
Returns the hash value for the \a type, using \a seed to seed the calculation.
*/
namespace QtPrivate { namespace QtPrivate {
#if !defined(QT_BOOTSTRAPPED) && !defined(Q_CC_MSVC) #if !defined(QT_BOOTSTRAPPED) && !defined(Q_CC_MSVC)

8
src/corelib/kernel/qmetatype.h
View File

@ -52,6 +52,7 @@
#ifndef QT_NO_QOBJECT #ifndef QT_NO_QOBJECT
#include <QtCore/qobjectdefs.h> #include <QtCore/qobjectdefs.h>
#endif #endif
#include <QtCore/qhashfunctions.h>
#include <array> #include <array>
#include <new> #include <new>
@ -2536,6 +2537,13 @@ constexpr const QtPrivate::QMetaTypeInterface *const qt_incomplete_metaTypeArray
QtPrivate::qTryMetaTypeInterfaceForType<Unique, T>()... QtPrivate::qTryMetaTypeInterfaceForType<Unique, T>()...
}; };
inline size_t qHash(QMetaType type, size_t seed = 0)
{
// We cannot use d_ptr here since the same type in different DLLs
// might result in different pointers!
return qHash(type.id(), seed);
}
QT_END_NAMESPACE QT_END_NAMESPACE
QT_DECL_METATYPE_EXTERN_TAGGED(QtMetaTypePrivate::QPairVariantInterfaceImpl, QT_DECL_METATYPE_EXTERN_TAGGED(QtMetaTypePrivate::QPairVariantInterfaceImpl,